Method of making vibrators



R. J. AUST METHOD OF MAKING VIBRATORS Dec. 12, 1944.

Filed Oct. 31, 1941 INVENTOR. Faber! J flasf ATTORNEY Patented Dec. 12, 1944 METHOD OF MAKING VIBRATORS so e J. Aust, Indianapolis, Ind., assignor to P. B. Mallory & 00., Inc., Indianapolis, Ind, a

corporation of Delaware Application October 31, 1941, Serial No. 417,361

1Claim.

This invention relates to a method of making vibrators.

An object of the invention is to improve vibrator construction and to improve and simplify the method of making and assembling vibrators.

Other objects of the invention will be apparent from the following description and accompanying drawing taken in connection with the appended claim.

The invention comprises the features of construction, combination of elements, arrangement of parts, and methods of manufacture and operation referred to above or which will be brought out and exemplified in the disclosure hereinafter set forth, including the illustrations in the drawing.

In the drawing:

Figure 1 is a side view, partly in section, of a vibrator embodying features of the present invention;

Figure 2 is a view of certain parts of the vibrator illustrating the method of assembly; and

Figure 3 is a section through a sub-assembly forming part of the vibrator.

A feature of the present invention resides in the vibrator frame construction and method of assembly wherein a separate core or pole piece of paramagnetic material, such as iron, is used upon which the vibrator electromagnetic winding is directly wound after which the pole piece is assembled with the remainder of the vibrator frame in a manner which will be made evident by the following description;

While a preferred embodiment of the invention is described herein, it is contemplated that considerable variation may be made in the method of procedure and the construction of parts without departing from the spirit of the invention. In the following description and in the claims, parts will be identified by specific names for convenience, but they are intended to be as generic in their application to similar parts .as the art will permit.

Referring to the drawing, Figure 1 shows a vibrator comprising a metal can l carrying projecting connecting temiinals II and containing the vibrator mechanism l2. The mechanism comprises a frame l3 of paramagnetic material, such as iron, having a substantially right angle bend at one end thereof to provide a transverse portion It. A T-shaped pole piece I! is welded against the outer end of transverse portion II, the cross arm 20 of the T being laid along and against the end of portion M.

The coil IQ of the vibrator is wound around to the base of frame l3 by stack assembly 22 com-.

prising insulating sheets clamped together by bolt 28 extending through an aperture in the frame. The vibrator reed carries contacts 24 which cooperate with stationary contacts 25 mounted on contact support arms 26 which are also clamped in the stack assembly.

Figures 2 and 3 illustrate in greater detail the preferred method of assembly. As shown in these figures T-shaped pole piece I 5 is provided with a pair of welding projections 27 on the cross arm 20. End discs I! and I8, which may preferably be slightly oval in shape to correspond to the shape of the finished coil are each provided with central transverse slots 28, longer than base 19 of the T so that the discs may readily be slipped over the base l9 and on to the body portion of the pole piece. Slots 28 are notched at their central portion to provide slots 29 crossing slots 28. I

The coil assembly is produced by first slipping end discs I! and I8 over the body of the pole piece and then rotating them to bring notches 29 into engagement with the edges of the body portion of the pole piece with one disc at one end and the other disc at the other end of the body portion. Coil l6 of insulated wire is then wound directly upon the body portion of the pole piece. This may suitably be done in an automatic winding machine which holds the pole piece and rotates it. If desired a protective covering of insulating tape .or the like may be placed over the outside of the coil after it is wound.

Ifhe pole piece 15, carrying wire winding i8 and end discs I1 and I8 is now placed against the free end of portion ll of the frame and the parts are clamped between welding electrodes and welding current is applied to weld the pole piece directly to the frame. During welding projections 21 are fused and the pole piece is brought into direct abutment with the frame to form an integral frame unit as shown in Figure 3.

'Heretofore it has been customary in making vibrators of this type to bend the frame into such shape as to provide a pole piece comprising part of-the frame. The coil was then separately produced by winding the wire upon a hollow bobbin. The bobbin was then slipped over the pole piece to complete the assembly.

The present invention makes possible the elimination of the bobbin and also enables the winding to be brought closer to the body of the pole piece. This produces more eifective coupling of the coil and the core or pole piece and improves voltage performance 01' the vibrator mechanism enabling starting and operation at lower voltages.

By the present provide a wider possible.

The invention also simplifies the construction of the frame and reduces the number of forming operations required in making the frame.

While the present invention, as to its objects and advantages, has been described herein as carried out in specific embodiments thereof, it is not desired to be limited thereby but it is intended to cover the invention broadly within the spirit and scope of the appended claim.

What is claimed is:

The method of making an electromagnetic vibratory interrupter magnet assembly including the following steps: bending over an end of an invention it is also possible to pole face than was heretofore elongated piece of strip metal stock at substantially right angles to the main body thereof,

threading a pair of end discs onto the body of a pole piece having a straight body portion with a long cross-arm integrally formed at one end thereof and a shorter cross-arm integrally formed at the other end thereof, said end discs having central slots therein longer than the shorter cross-arm of said pole piece, said slots being notched at their central portion to provide shorter cross slots, said longer slots being aligned with the shorter cross-arm of the said pole piece when said discs are threaded thereoyer, then rotating said discs through 90 to bring said shorter cross slots into engagement with the edges of the body portion of said pole piece near its ends, then winding an insulated wire directly onto the body of said pole piece, and then welding the crossarm of the pole piece against the free end of the bent over portion or said piece of strip metal stock with the body of said pole piece extending in the same direction as the body of said strip metal stock in spaced parallel relation thereto.

ROBERT J. AUST. 

